topic Re: C implementation blhost protocol (for use in MCU) in MCX Microcontrollers

C implementation blhost protocol (for use in MCU)

dav1 — Tue, 10 Feb 2026 12:38:15 GMT

Is there a compact implementation in C available for the protocol blhost uses to communicate with the rom-bootloader of MCX mcu's?

essentials to basically run this on another LPC/MCX -> UART -> MCX (in isp mode)

blhost -u -- flash-image your_app.bin erase

Re: C implementation blhost protocol (for use in MCU)

Celeste_Liu — Wed, 11 Feb 2026 03:38:29 GMT

Hello @dav1 ，

Thanks for your post. Sorry, but we don’t have any C implementation of the protocol that blhost uses in MCU.
I’m afraid you would need to implement it yourself.

Have a nice day.

Celeste

Re: C implementation blhost protocol (for use in MCU)

dav1 — Wed, 04 Mar 2026 13:24:48 GMT

would be great if NXP can support here.

the source-code is most likely available in C as part of the mcuxpresso gui tools for flashing

Re: C implementation blhost protocol (for use in MCU)

dav1 — Wed, 04 Mar 2026 13:34:10 GMT

note that you do this:
https://github.com/nxp-mcuxpresso/rblhost